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Hi iv'e been investigating this since it came on youtube, 3 problems came to mind 1, if it was done as a hoax ,to what end ,its not funny in anyway
2, Hoaxers like other people to know they did it.
3, I worked in the Radio field for a long time 30yr and the amount of
power to break into and overtake the bbc 4 transmission would have
to be gigawatts on uhf.
The only people at that time to have that sort of power was the millitary or it's not a hoax , I beleive the latter .